IPv4 R&E Routing Table Report 17:05 GMT Thu 18 Sep, 2025 IPv4 BGP Table (R&E) as seen at ASREN. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/ASREN/ Analysis Summary ---------------- BGP routing table entries examined: 13103 Prefixes after maximum aggregation (per Origin AS): 7891 Deaggregation factor: 1.66 Unique aggregates announced (without unneeded subnets): 8671 Number of IPv4 prefixes with a valid ROA: 5749 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7353 Total ASes present in the Internet Routing Table: 2012 Prefixes per ASN: 6.51 Origin-only ASes present in the Internet Routing Table: 1742 Origin ASes announcing only one prefix: 824 Transit ASes present in the Internet Routing Table: 270 Transit-only ASes present in the Internet Routing Table: 38 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.5 Max AS path length visible: 14 Max AS path prepend of ASN ( 30116) 10 Prefixes from unregistered ASNs in the Routing Table: 32 Number of instances of unregistered ASNs: 32 Number of 32-bit ASNs allocated by the RIRs: 47458 Number of 32-bit ASNs visible in the Routing Table: 524 Prefixes from 32-bit ASNs in the Routing Table: 1364 Number of bogon 32-bit ASNs visible in the Routing Table: 0 Special use prefixes present in the Routing Table: 0 Prefixes being announced from unallocated address space: 2 Number of addresses announced to Internet: 155776640 Equivalent to 9 /8s, 72 /16s and 246 /24s Percentage of available address space announced: 4.2 Percentage of allocated address space announced: 4.2 Percentage of available address space allocated: 100.0 Percentage of address space in use by end-sites: 99.6 Total number of prefixes smaller than registry allocations: 1616 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3394 Total APNIC prefixes after maximum aggregation: 1769 APNIC Deaggregation factor: 1.92 Prefixes being announced from the APNIC address blocks: 3392 Unique aggregates announced from the APNIC address blocks: 1868 APNIC Region origin ASes present in the Internet Routing Table: 451 APNIC Prefixes per ASN: 7.52 APNIC Region origin ASes announcing only one prefix: 204 APNIC Region transit ASes present in the Internet Routing Table: 43 Average APNIC Region AS path length visible: 4.2 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 204 Number of APNIC addresses announced to Internet: 37596000 Equivalent to 2 /8s, 61 /16s and 171 /24s APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431 (pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319, 58368-59391, 63488-64098, 64297-64395, 131072-155961 APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8, 49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8, 106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8, 116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8, 123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8, 163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8, 222/8, 223/8, ARIN Region Analysis Summary ---------------------------- Prefixes being announced by ARIN Region ASes: 5367 Total ARIN prefixes after maximum aggregation: 3186 ARIN Deaggregation factor: 1.68 Prefixes being announced from the ARIN address blocks: 5412 Unique aggregates announced from the ARIN address blocks: 3606 ARIN Region origin ASes present in the Internet Routing Table: 870 ARIN Prefixes per ASN: 6.22 ARIN Region origin ASes announcing only one prefix: 322 ARIN Region transit ASes present in the Internet Routing Table: 115 Average ARIN Region AS path length visible: 5.1 Max ARIN Region AS path length visible: 14 Number of ARIN region 32-bit ASNs visible in the Routing Table: 140 Number of ARIN addresses announced to Internet: 60169792 Equivalent to 3 /8s, 150 /16s and 30 /24s ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106 (pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153 3354-4607, 4865-5119, 5632-6655, 6912-7466 7723-8191, 10240-12287, 13312-15359, 16384-17407 18432-20479, 21504-23551, 25600-26591, 26624-27647, 29696-30719, 31744-33791 35840-36863, 39936-40959, 46080-47103 53248-55295, 62464-63487, 64198-64296, 393216-402332 ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8, 12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8, 20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8, 29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8, 40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8, 54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8, 131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8, 139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8, 148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8, 159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8, 167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8, 184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8, 207/8, 208/8, 209/8, 214/8, 215/8, 216/8, RIPE Region Analysis Summary ---------------------------- Prefixes being announced by RIPE Region ASes: 3192 Total RIPE prefixes after maximum aggregation: 2614 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3181 Unique aggregates announced from the RIPE address blocks: 2679 RIPE Region origin ASes present in the Internet Routing Table: 572 RIPE Prefixes per ASN: 5.56 RIPE Region origin ASes announcing only one prefix: 257 RIPE Region transit ASes present in the Internet Routing Table: 91 Average RIPE Region AS path length visible: 3.8 Max RIPE Region AS path length visible: 12 Number of RIPE region 32-bit ASNs visible in the Routing Table: 140 Number of RIPE addresses announced to Internet: 56429696 Equivalent to 3 /8s, 93 /16s and 12 /24s RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614 (pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631 6656-6911, 8192-9215, 12288-13311, 15360-16383 20480-21503, 24576-25599, 28672-29695 30720-31743, 33792-35839, 38912-39935 40960-45055, 47104-52223, 56320-58367 59392-61439, 61952-62463, 64396-64495 196608-216475 RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8, 53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8, 185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8, 217/8, LACNIC Region Analysis Summary ------------------------------ Prefixes being announced by LACNIC Region ASes: 471 Total LACNIC prefixes after maximum aggregation: 249 LACNIC Deaggregation factor: 1.89 Prefixes being announced from the LACNIC address blocks: 470 Unique aggregates announced from the LACNIC address blocks: 418 LACNIC Region origin ASes present in the Internet Routing Table: 34 LACNIC Prefixes per ASN: 13.82 LACNIC Region origin ASes announcing only one prefix: 15 LACNIC Region transit ASes present in the Internet Routing Table: 11 Average LACNIC Region AS path length visible: 4.3 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 9 Number of LACNIC addresses announced to Internet: 829024 Equivalent to 0 /8s, 12 /16s and 166 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-274844 + ERX transfers LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8, 191/8, 200/8, 201/8, AfriNIC Region Analysis Summary ------------------------------- Prefixes being announced by AfriNIC Region ASes: 647 Total AfriNIC prefixes after maximum aggregation: 69 AfriNIC Deaggregation factor: 9.38 Prefixes being announced from the AfriNIC address blocks: 646 Unique aggregates announced from the AfriNIC address blocks: 98 AfriNIC Region origin ASes present in the Internet Routing Table: 46 AfriNIC Prefixes per ASN: 14.04 AfriNIC Region origin ASes announcing only one prefix: 26 AfriNIC Region transit ASes present in the Internet Routing Table: 7 Average AfriNIC Region AS path length visible: 6.1 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 31 Number of AfriNIC addresses announced to Internet: 749824 Equivalent to 0 /8s, 11 /16s and 113 /24s AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8, APNIC Region per AS prefix count summary ---------------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 605 2169 462 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 4538 183 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 170 281 114 AARNET-AS-AP Australian Academic and Rese 55824 149 19 21 NKN-CORE-NW NKN Core Network, IN 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 2697 56 4 33 ERX-ERNET-AS Education and Research Netwo 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 132524 42 8 9 TIFR-AS Tata Institute of Fundamental Res Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 5786 198 16 1 UPRENET, PR 2920 178 34 7 LACOE, US 2152 148 491 97 CENIC-2152, US 18558 138 18 4 NETBLK-RCOEK, US 21976 88 34 14 NJEDGE-NET, US 376 79 6 56 RISQ-AS, CA 1736 79 16 1 MU-AS, US 3477 72 77 34 NOAA-NWAVE, US 22742 70 37 32 CT-EDU-NET, US 81 66 228 17 NCREN, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 786 190 1742 185 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Switch, Swiss Academic and Researc 1103 98 1503 84 SURFNET-NL SURFnet, The Netherlands, NL 2614 92 26 69 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 78 88 73 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 64 630 59 FR-RENATER Reseau National de telecommuni 200521 58 4 27 SEAP-AGE, ES Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 246 51 124 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 18 40 18 UNIVERSIDADE DE SAO PAULO, BR 278 10 9 9 Universidad Nacional Autonoma de Mexico, 28027 7 2 1 Escuela Superior Politecnica del Litoral, 52992 5 5 5 UNIVERSIDADE FEDERAL DE SAO PAULO, BR 27817 4 1 4 Red Nacional Academica de Tecnologia Avan 61468 4 0 3 CEDIA, EC 1251 3 0 2 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 484 82 3 KENET-AS, KE 37215 39 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 327700 11 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 327947 6 4 1 KNUST-, GH 37404 4 0 1 University-of-Ibadan, NG 37661 4 6 4 NRaE1-AS, NG 327798 4 0 3 BERNET, BI Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 605 2169 462 SINET-AS Research Organization of Informa 36914 484 82 3 KENET-AS, KE 7497 452 180 23 CSTNET-AS-AP Computer Network Information 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 1916 246 51 124 Rede Nacional de Ensino e Pesquisa, BR 5786 198 16 1 UPRENET, PR 786 190 1742 185 JANET Jisc Services Limited, GB 4538 183 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 178 34 7 LACOE, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 484 481 KENET-AS, KE 7497 452 429 CSTNET-AS-AP Computer Network Information Cente 5786 198 197 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 178 171 LACOE, US 18558 138 134 NETBLK-RCOEK, US 55824 149 128 NKN-CORE-NW NKN Core Network, IN 1916 246 122 Rede Nacional de Ensino e Pesquisa, BR 4538 183 112 ERX-CERNET-BKB China Education and Research Net 1736 79 78 MU-AS, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.82.0/24 3112 OARNET-AS-1, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 164.160.192.0/21 Origin: 37661 NRaE1-AS, NG 164.160.192.0/21 Transit: 37288 WACREN, SN 203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University 203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res Complete listing at https://bgp.nsrc.org/REN/ASREN/data-add-IANA Number of prefixes announced per prefix length (Global) ------------------------------------------------------- /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:0 /9:1 /10:1 /11:0 /12:9 /13:16 /14:30 /15:96 /16:1528 /17:262 /18:282 /19:400 /20:532 /21:591 /22:989 /23:1087 /24:7097 /25:56 /26:79 /27:47 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 460 484 KENET-AS, KE 1916 87 246 Rede Nacional de Ensino e Pesquisa, BR 31638 44 44 ASN-LEPIDA, IT 37215 33 39 MAREN, MW 200521 33 58 SEAP-AGE, ES 25977 28 42 HCCS, US 60187 25 50 LGFL-AS, GB 26898 24 64 RESERVED, ZZ 32440 21 29 LONI, US 22742 20 70 CT-EDU-NET, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:18 8:2 12:1 14:93 23:5 24:2 31:1 35:4 37:26 38:2 40:1 41:150 42:13 44:5 45:22 46:5 47:1 49:12 50:1 58:15 59:17 60:6 62:5 63:3 64:26 65:3 66:22 67:32 68:4 69:12 70:2 72:7 74:18 76:13 77:6 78:3 79:9 80:8 81:27 82:2 83:7 84:6 85:28 87:1 89:15 91:35 93:15 94:2 95:1 96:5 98:2 101:3 102:11 103:277 104:69 108:4 109:1 110:1 111:1 114:1 118:33 119:31 121:17 122:8 124:42 128:35 129:33 130:83 131:53 132:52 133:156 134:79 136:196 137:44 138:11 139:5 140:12 141:1 142:21 143:11 144:40 145:12 146:123 147:14 148:9 149:11 150:7 151:8 152:63 153:13 154:15 155:48 156:128 157:7 158:28 159:116 160:32 161:26 162:13 163:72 164:8 165:4 167:7 168:35 169:5 170:13 173:5 175:4 179:3 180:16 182:2 184:8 185:41 187:2 188:19 191:1 192:1119 193:252 194:87 195:68 196:11 197:351 198:308 199:184 200:158 202:385 203:184 204:304 205:66 206:123 207:194 208:48 209:50 210:102 211:2 212:42 213:4 216:47 217:23 219:6 222:3 223:5 End of report